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structure of battlement

the parapet of a wall consisting of alternating low portions known as
crenels, or
crenelles (hence
crenellated walls with battlements), and high portions called merlons. Battlements were devised in order that warriors might be protected by the merlons and yet be able to discharge arrows or other missiles through the
crenels. The battlement was an early development in military architecture; it...

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